experiment

Charts and diagrams indicating areas of blindness in people with visual…

Cow grazing in field, cow in laboratory with rubber stopper in its side…

Man talks about about farming/ranching problems and how to solve them…

Troops walking in formation. Scientist experimenting with liquids in…

ECU mosquito, lice, flea, fly. Reports the history of the use of DDT.…

Dr. Francis Crick describes the discovery of the double helix structure…

A man and a little girl walk into a room and sit behind a table. The…

A boy and a girl stand in front of a chalkboard. The boy rubs a small…

An electric current is applied to a compass and the needle moves.…

An adult man and a young girl sit at a table and conduct an electricity…

A young man talks about his science experiment. He wears a green plaid…

Scientific experiment in which three men dressed in blue and sitting in…